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" (ii) "(cos5x+cos4x)/(1-2cos3x)=-cos2x-...

" (ii) "(cos5x+cos4x)/(1-2cos3x)=-cos2x-cos x

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To prove (cos5x+cos4x)/(1-2cos3x)=-cos2x-cos x

int(cos5x+cos4x)/(1-2cos3x)dx

int(cos5x+cos4x)/(1-2cos3x)dx

To prove (cos5x+cos4x)/(1-2cos3x) = -cos2x-cosx

int (cos 5x + cos 4x)/(1-2cos3x) dx

int (cos 5x + cos 4x)/(1-2cos3x) dx

2cos x-cos3x-cos5x=

Prove that: (cos7x-cos8x)/(1+2cos5x)=cos2x-cos3x

Prove that: (cos7x-cos8x)/(1+2cos5x)=cos2x-cos3x

If (cos5x+cos4x)/(2cos3x-1)=cos x+cos nx then find n'